WO2000073114A1 - Device and method for controlling an electrically actuated parking brake - Google Patents

Device and method for controlling an electrically actuated parking brake Download PDF

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Publication number
WO2000073114A1
WO2000073114A1 PCT/EP1999/003792 EP9903792W WO0073114A1 WO 2000073114 A1 WO2000073114 A1 WO 2000073114A1 EP 9903792 W EP9903792 W EP 9903792W WO 0073114 A1 WO0073114 A1 WO 0073114A1
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WO
WIPO (PCT)
Prior art keywords
parking brake
input means
driver
fs
characterized
Prior art date
Application number
PCT/EP1999/003792
Other languages
German (de)
French (fr)
Inventor
Jürgen Böhm
Joachim Nell
Original Assignee
Continental Teves Ag & Co. Ohg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Priority to PCT/EP1999/003792 priority Critical patent/WO2000073114A1/en
Publication of WO2000073114A1 publication Critical patent/WO2000073114A1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8167311&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000073114(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00Brake-action initiating means
    • B60T7/02Brake-action initiating means for personal initiation
    • B60T7/04Brake-action initiating means for personal initiation foot actuated
    • B60T7/042Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00Brake-action initiating means
    • B60T7/02Brake-action initiating means for personal initiation
    • B60T7/08Brake-action initiating means for personal initiation hand actuated
    • B60T7/10Disposition of hand control
    • B60T7/107Disposition of hand control with electrical power assistance

Abstract

The invention relates to a device and a method for controlling a parking brake (3) which can be electrically actuated. In particular, a button (1) is provided which can be displaced into a tensioning position, a release position and a neutral position. If the driver displaces the button into the tensioning position, for example, the control unit (2) increases a target value, FS_soll, of the actuating force of the parking brake (3). By operating the button (1), the driver is thus able to determine which actuating force is used to actuate the parking brake (3).

Description

Device and method for controlling an electrically actuated parking brake

The invention relates to a device and a method for controlling an electrically actuated parking brake, in particular a driver's request for actuating the parking brake is converted into corresponding target values for the parking brake.

Parking brake systems are known from the prior art, which are connected via cables and linkages to a device actuated by the driver through muscle power. The muscle-powered device is, for example, a pedal operated by the driver's foot or a hand brake lever.

Parking brakes are also recently known in which an electromotive brake actuation is provided. For example, in DE 4129919 AI it is described that electric motors are arranged on the wheel brakes, which can be controlled via a corresponding signal, so that the parking brake is activated.

However, this electrically operated parking brake has the disadvantage that the driver's request is not sufficiently taken into account. When the parking brake is actuated or activated, for example, a maximum clamping force would always be set, which leads to excessive loads on the brake system at an early stage. This would in turn result in that the parking brake system would have to be designed to withstand these loads, which increases the manufacturing price.

An object of the invention is to provide a device and a method for controlling an electrically actuated parking brake, which detect a driver's request via an operating element and convert it into corresponding target values for the actuating force.

This object is achieved in accordance with the features of the independent claims. The dependent claims specify advantageous embodiments and further developments of the invention.

According to the invention, a device for controlling an electrically actuated parking brake is provided, which can have input means for a driver's request regarding an actuation of the parking brake. The device according to the invention can furthermore contain a control unit for detecting the driver's request via a corresponding output signal of the input means. The control unit can also determine a setpoint FS_soll in accordance with the driver's request and output a control signal to an actuator of the parking brake in accordance with the ascertained setpoint FS_soll.

With the solution according to the invention, the driver's request can be converted directly into a corresponding target value FS_soll of the actuating force of the parking brake. The actuating force can correspond approximately to a clamping force or a rope force. The actuator can be an electric motor that directly brakes a brake shoe against a rotating pressing part of the wheel brake. However, it is also possible for the electric motor or the actuator to actuate a cable pull, which then actuates the wheel brake or the parking brake via corresponding deflection means.

Because a setpoint value corresponding to the driver's request is generated, a system can be implemented which essentially corresponds to that of the conventional muscle-operated parking brake. The driver therefore hardly has to get used to it, since he is able to use the input means to indicate a corresponding actuation force according to his wish. If the driver places the vehicle on a flat surface, for example, he is now able to actuate the electrically actuated parking brake only slightly according to his wishes. If the driver parked the vehicle on a steep slope, for example on a slope with an incline of 30%, he can now set the maximum actuation force. This means that the parking brake is only loaded with the maximum actuation force if this is also necessary. This naturally promotes the service life of the brake system. Furthermore, the driver can also use the parking brake according to the invention as a starting aid on gradients if the operator chooses a low actuation force.

According to the invention, the input means can be actuated by the driver into a clamping position, a release position and a rest position. The input means can also be designed as a button, this button being designed redundantly. This can further increase the safety of the actuation and it is possible to identify possible errors. According to the invention, when the input means are in a rest position, an actual value FS_actual of the parking brake can be maintained. If the input means are in the release position, the setpoint FS_soll is set to zero. If the input means are still in the clamping position, the setpoint FS_soll is increased starting from the actual value FS_act.

The setpoint FS_soll can be gradually increased in a clamping position up to a limit value FS_max. Of course, the setpoint FS_soll can also be increased continuously, if desired.

At this point it should be noted that the aforementioned example of the execution of the input means as a button is only one option. It is also conceivable to provide a slide switch, for example, which specifies the setpoint FS_soll. Of course, other input means are also possible, but care should be taken to ensure that the input means enable haptic feedback. As a result, when the input means are actuated, the driver can receive feedback regarding the state in which the parking brake is currently located or which setpoint is being specified.

Furthermore, it is possible to display the actual value FS_act and / or the setpoint FS-target by means of an optical display device. Such an optical display device would be, for example, light-emitting diodes or similar means which indicate to the driver which actuating force of the parking brake is currently present or which actuating force of the parking brake is or has been entered as a target value via the input means. Furthermore, after a predetermined period of time T rest has elapsed after the last actuation of the input means, the control unit can switch control electronics of the parking brake into a rest state with a minimal power consumption. This makes it possible to implement a switch-off delay which switches the control electronics or the control unit into an operating mode with a minimal power consumption. At this point it should also be noted that a separate control unit for the electrically actuated parking brake can be implemented. However, it is also possible to integrate the control unit or the control electronics for the parking brake in an existing control unit, for example in the control unit for the ABS brake system.

Exemplary embodiments of the invention are explained in more detail below with the aid of schematic drawings. Show it:

Fig. 1 is a schematic representation of a device according to the invention;

Fig. 2 graphical representation of a course of the setpoint and 3 FS_soll over time and

Fig. 4 is a flow chart showing an example of processing according to the invention in the control unit.

Fig. 1 shows a button 1, which, if not actuated, remains in a rest position. This rest position is shown in FIG. 1. Would push button 1 by a driver are actuated on its left side, the button 1 would move into a clamping position, a release position being present when the button 1 was actuated on its right side.

The button 1 is redundant and each designed as a changeover switch, which represents a digitally operating actuator. 1 corresponds to the switch position Sl = 0 (open), Sl '= 1 (closed), S2 = 0 (open) and S2' = 1 (closed).

In the clamping position, Sl = 1 and S2 = 0 and in the release position, Sl = 0 and S2 = 1. If Sl = 1 and S2 = 1, an implausible combination can be concluded and thus an error of button 1 or a control unit 2 and in this case the control unit 2 would not actuate the parking brake 3 and thus would not change the current actual value. In this case, an error message could also be output to a diagnostic unit and a corresponding warning lamp could be activated.

The button 1 is electrically connected to the control unit 2 so that the driver's request can be converted into corresponding control signals for activating the parking brake 3.

The parking brake 3 has an electric motor 6 and 7 on at least two wheel brakes 4 and 5, respectively. The electric motor 6 can be controlled via a control line 8 and the electric motor 7 via a control line 9. Corresponding commands can be issued to the electric motors 6 and 7 via the control lines 8 and 9, so that these set the required actuation force FS_soll. The electric motors 6 and 7 also have feedback lines 10 and 11, which transmit the actual position and / or the actual actuating force to a microcomputer 12, 13, respectively. The microcomputer 12, 13 is now able to ensure that the setpoint specified via the lines 8, 9 is reached. The control of the electric motors 6 and 7 takes place via corresponding amplifiers 14 and 15.

An emergency circuit 16 is also provided, which supplies the amplifiers 14 and 15 with current. The emergency circuit 16 can ensure that the power supply via an auxiliary battery 18 is ensured in the event of a failure of a main battery 17.

The entire system shown in FIG. 1 is designed redundantly, so that operational reliability is still guaranteed in the event of the failure of an element or component.

It should also be noted at this point that a signal from a controller area network (CAN) can also be superimposed on the button 1 or the input means in order to activate the parking brake, for example in accordance with a hill holder function, or the actuating force in accordance with a measured Adjust slope.

2 shows the position of the switch S1 over the time t in the upper representation and the setpoint FS_soll over the time t in the lower representation. The same applies to FIG. 3.

It applies to both figures or representations that switch S2 is open, ie S2 = 0. In Fig. 2 it is shown that the switch S1 is closed at a certain time, which is a digital

1 corresponds. When the control unit 2 detects this signal, it increases the target value of the actuating force by an amount ΔF 0 . If the button remains in the tensioned position, then Δtj . the setpoint FS_soll is increased by a further amount ΔF : . After a further period of time .DELTA.t 2 , the setpoint FS_soll is increased by a further amount .DELTA.F 2 , etc. It should be noted at this point that the amounts of the increase in the setpoint and the time periods for maintaining the increases are not carried out equally. For example, it may be advantageous that the initial amount ΔF 0 is greater than the subsequent amounts ΔFi, ΔF 2 , ΔF 3 , etc. This enables the parking brake system to be activated quickly at the beginning, but avoiding that the maximum value is applied too early. The maximum value can only be reached after pressing button 1 for a longer period.

In Fig. 3 it is shown that the button 1 is first brought up to a time T in a clamping position. Thereafter, the button 1 is no longer pressed and goes into its rest position. This means that the setpoint FS_soll is kept constant. If the button 1 is then returned to the clamping position, the setpoint FS_soll is increased by an amount ΔF 0 , based on the actual value of the actuating force FS_act.

It should be noted that it is of course also possible to continuously increase the setpoint FS_soll; the same applies to the setting of identical force increments ΔF 0 , lr

2 ... and time increments Δt l 2 , 3 ... • FIG. 4 shows a flow chart of a processing as can be carried out in the control unit 2 or in the microprocessors 12 and 13.

In a step 100, the processing is initialized and a timer is deleted. Furthermore, a default value for FS_soll is loaded. This default value can mean a predetermined actuation or movement of the brake shoes in the direction of the rotating part of the parking brake 3 in order to minimize the actuation paths of the parking brake. In a step 101, a query is made as to whether the switch S1 of the button 1 is actuated (Sl = 1). If S1 is actuated, it is concluded that the button 1 is in a tensioned position, whereupon a query is made in step 102 as to whether the switch S2 is additionally actuated (S2 = 1). If this is the case, then an error in the system or the button 1 is inferred and the processing goes back between steps 100 and 101. This means that the parking brake 3 is not activated and / or its state is not changed.

If it is judged in step 102 that switch S2 is not actuated, the timer is started in step 103. In a step 104, a query is made as to whether a predetermined time interval ΔTi has been reached. If this is the case, the setpoint FS_soll is increased by F X and the values ΔF 1 + 1 and ΔT 1 + 1 are loaded for the next increase level. The timer is reset. In a step 106, it is then checked whether the setpoint FS_soll has reached a maximum value FS_max, and if so, the setpoint FS_soll is limited to this maximum value FS_max. The calculated setpoint is then output in a step 107 and the processing branches back between steps 100 and 101.

If it was judged in step 104 that the time interval ΔTi has not been reached, a branch is made between steps 106 and 107. This means that the setpoint is kept constant since the predetermined time interval ΔTi has not yet expired.

If it is judged in step 101 that the switch S1 is not actuated, the timer is reset or deleted again in a step 108. Then, in a step 109, the value ΔF 0 for the start increase level and ΔT 0 for the start time interval is loaded (increase level = 0). In a step 110 it is then checked whether the switch S2 is actuated (S2 = 1). If the switch S2 is actuated, a release position of the button 1 is inferred and a command for releasing the electrically actuated parking brake is issued in step 111, the value FS_soll being set to 0. Processing then branches back between steps 100 and 101.

If it is judged in step 110 that the switch S2 is not actuated (S2 = 0), it is concluded that the button 1 is in its rest position. The last calculated setpoint FS_soll is then output to the parking brake 3 in a step 112, ie the actual state is retained. As shown above, if the input means or the push button (S1 = 0, S2 = 0) is not actuated, it is concluded that it is in a rest position. The current actuation state of the parking brake 3 is thus maintained, the last specific target value (FS_soll) for the electric parking brake 3 being maintained and / or being set by means of the corresponding control / regulation.

If the button is brought into a release position (Sl = 0, S2 - 1), a command to release it is issued to the control system regardless of the current actuation state of the parking brake 3 (FS_soll = 0). The electric parking brake is then released and an air clearance is set (to minimize the actuation distances). It is not necessary to keep the input means or the button pressed in the release position during the entire release process of the parking brake 3. Rather, it is sufficient to initiate the release of the parking brake 3 by briefly actuating the switch into the release position.

If the button is brought into its tensioned position (Sl = 1, S2 = 0), the setpoint FS_setpoint that was present before the button was pressed is gradually increased as long as the button is pressed. If the switch is released again after a predetermined time T, i.e. if the button changes to the idle position and is then operated again, the procedure for gradually increasing the setpoint is reinitialized and started again (until the maximum setpoint FS_max is reached or as long as the button remains in its tensioned position).

Claims

 1. Device for driving an electrically actuated Parking brake (3) with input means for one Driver request regarding an operation of the Parking brake (3), and a control unit (2) for Recording the driver's request via a corresponding one Output signal of the input means for determining a Setpoint FSset the actuating force of the Parking brake (3) according to the driver's request and Outputting a control signal to an actuator Parking brake (3) according to the determined target value FS target.
2. Device according to claim 1, characterized in that the input means can be brought into a clamping position, a release position and a rest position by the driver.
3. Device according to claim 2, characterized in that the input means are designed as buttons (1) and switches S1 and S2 actuated by the button (1) are designed redundantly.
4. The device according to at least one of claims 1 to 3, characterized in that when the input means are in the rest position, an actual value FS is the parking brake (3) is maintained.
5. The device according to at least one of claims 1 to 4, characterized in that when the input means are in the release position, the setpoint FS¯soll is set to zero.
6. The device according to at least one of claims 1 to 5, characterized in that when the input means are in the clamping position, the setpoint FS is to be increased based on the actual value FS-actual.
7. The device according to claim 6, characterized in that when the input means are in the clamping position, the target value FS should gradually up to one Limit FS max is increased.
8. The device according to at least one of claims 1 to 7, characterized in that the control unit (2) after expiry of a predetermined period of time TRUHE after the last actuation of the input means, a control electronics of the parking brake (3) switches to an idle state with a minimal power consumption .
9. The device according to at least one of claims 1 to 8, characterized in that the actual value FS is represented by an optical display device.
10. The device according to at least one of claims 1 to 9, characterized in that the input means give a haptic feedback of the operating state.
11. Method for driving an electrically operated Parking brake (3) with the steps: Enter a driver request regarding an actuation of the parking brake (3) via correspondingly provided Input means, Detecting the driver's request via a corresponding output signal from the input means, determining a target value FS-target according to the driver's request and outputting a control signal to an actuator of the parking brake (3) according to the determined target value FS target.
PCT/EP1999/003792 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake WO2000073114A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/003792 WO2000073114A1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1999513146 DE59913146D1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake
PCT/EP1999/003792 WO2000073114A1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake
EP19990926498 EP1187745B1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake
US09/980,418 US6802401B1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake
JP2000621203A JP2003500291A (en) 1999-06-01 1999-06-01 Apparatus and method for controlling electrically operable parking brake

Publications (1)

Publication Number Publication Date
WO2000073114A1 true WO2000073114A1 (en) 2000-12-07

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ID=8167311

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/003792 WO2000073114A1 (en) 1999-06-01 1999-06-01 Device and method for controlling an electrically actuated parking brake

Country Status (5)

Country Link
US (1) US6802401B1 (en)
EP (1) EP1187745B1 (en)
JP (1) JP2003500291A (en)
DE (1) DE59913146D1 (en)
WO (1) WO2000073114A1 (en)

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WO2002046016A1 (en) * 2000-12-08 2002-06-13 Conti Temic Microelectronic Gmbh Method for operating a braking system of a parked motor vehicle
EP1219518A2 (en) * 2000-12-29 2002-07-03 TRW Automotive Electronics & Components GmbH & Co. KG A park brake system for vehicles
GB2376993A (en) * 2001-06-28 2002-12-31 Ford Global Tech Inc Electric control system for parking brake application in a moving vehicle
FR2841858A1 (en) * 2002-07-04 2004-01-09 Bosch Gmbh Robert Parking brake regulation method for electromechanical vehicle brake system involves determining brake force when parking brake is operated and increasing force when measured force is below desired value
WO2006003042A1 (en) * 2004-07-07 2006-01-12 Siemens Aktiengesellschaft Electronic parking brake and method for controlling an electronic parking brake
DE102006009729A1 (en) * 2006-03-02 2007-09-06 Siemens Ag Control process for electric parking brake involves detecting position by control unit and electronic unit, reporting duration in set position and sending control signal
WO2009043702A1 (en) * 2007-09-28 2009-04-09 Continental Automotive Gmbh Method for controlling an electromechanical parking brake system of a vehicle, and corresponding system
DE102008034645A1 (en) * 2008-07-25 2010-01-28 Volkswagen Ag Parking brake actuating device for brake assembly in motor vehicle, has display unit quantitatively displaying actually adjusted clamping force of parking brake and/or actuation time of control element
US9221446B2 (en) 2008-03-04 2015-12-29 Lucas Automotive Gmbh Controlling an electrically actuable parking brake in the event of failure of a speed signal
DE10351589B4 (en) * 2003-11-05 2018-01-11 Audi Ag Actuation system for closing an electromechanical parking brake

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WO2002046016A1 (en) * 2000-12-08 2002-06-13 Conti Temic Microelectronic Gmbh Method for operating a braking system of a parked motor vehicle
US6738703B2 (en) 2000-12-08 2004-05-18 Conti Temic Microelectronic Gmbh Method of operating a braking system of a parked motor vehicle
EP1219518A2 (en) * 2000-12-29 2002-07-03 TRW Automotive Electronics & Components GmbH & Co. KG A park brake system for vehicles
EP1219518A3 (en) * 2000-12-29 2002-08-21 TRW Automotive Electronics & Components GmbH & Co. KG A park brake system for vehicles
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GB2376993A (en) * 2001-06-28 2002-12-31 Ford Global Tech Inc Electric control system for parking brake application in a moving vehicle
GB2376993B (en) * 2001-06-28 2004-10-20 Ford Global Tech Inc Electric Parking Brake
FR2841858A1 (en) * 2002-07-04 2004-01-09 Bosch Gmbh Robert Parking brake regulation method for electromechanical vehicle brake system involves determining brake force when parking brake is operated and increasing force when measured force is below desired value
DE10351589B4 (en) * 2003-11-05 2018-01-11 Audi Ag Actuation system for closing an electromechanical parking brake
WO2006003042A1 (en) * 2004-07-07 2006-01-12 Siemens Aktiengesellschaft Electronic parking brake and method for controlling an electronic parking brake
US8763767B2 (en) 2004-07-07 2014-07-01 Continental Automotive Gmbh Electronic parking brake and method for controlling an electronic parking brake
DE102006009729A1 (en) * 2006-03-02 2007-09-06 Siemens Ag Control process for electric parking brake involves detecting position by control unit and electronic unit, reporting duration in set position and sending control signal
WO2009043702A1 (en) * 2007-09-28 2009-04-09 Continental Automotive Gmbh Method for controlling an electromechanical parking brake system of a vehicle, and corresponding system
US8352144B2 (en) 2007-09-28 2013-01-08 Continental Automotive Gmbh Method for controlling an electromechanical parking brake system of a vehicle and corresponding system
US9221446B2 (en) 2008-03-04 2015-12-29 Lucas Automotive Gmbh Controlling an electrically actuable parking brake in the event of failure of a speed signal
DE102008034645A1 (en) * 2008-07-25 2010-01-28 Volkswagen Ag Parking brake actuating device for brake assembly in motor vehicle, has display unit quantitatively displaying actually adjusted clamping force of parking brake and/or actuation time of control element

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DE59913146D1 (en) 2006-04-27
US6802401B1 (en) 2004-10-12
JP2003500291A (en) 2003-01-07
EP1187745B1 (en) 2006-02-22
EP1187745A1 (en) 2002-03-20

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